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CVE-2021-47176: s390/dasd: add missing discipline function

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-03-25 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: s390/dasd: add missing discipline function Fix crash with illegal operation exception in dasd_device_tasklet. Commit b72949328869 ("s390/dasd: Prepare for additional path event handling") renamed the verify_path function for ECKD but not for FBA and DIAG. This leads to a panic when the path verification function is called for a FBA or DIAG device. Fix by defining a wrapper function for dasd_generic_verify_path().

Affected products

• Linux kernel: from 5.4.235 before 5.4.237; from 5.10.173 before 5.10.175; from 5.11 before 5.12.9; 5.13-rc1, 5.13-rc2, 5.13-rc3 — fixed in 5.10.175, 5.12.9, 5.4.237

How to fix

Upgrade to a fixed version: Linux kernel 5.10.175, 5.12.9, 5.4.237. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/6a16810068e70959bc1df686424aa35ce05578f1
• https://git.kernel.org/stable/c/a16be88a3d7e5efcb59a15edea87a8bd369630c6
• https://git.kernel.org/stable/c/aa8579bc084673c651204f7cd0d6308a47dffc16
• https://git.kernel.org/stable/c/c0c8a8397fa8a74d04915f4d3d28cb4a5d401427
• https://git.kernel.org/stable/c/6a16810068e70959bc1df686424aa35ce05578f1
• https://git.kernel.org/stable/c/a16be88a3d7e5efcb59a15edea87a8bd369630c6
• https://git.kernel.org/stable/c/aa8579bc084673c651204f7cd0d6308a47dffc16
• https://git.kernel.org/stable/c/c0c8a8397fa8a74d04915f4d3d28cb4a5d401427

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